Insulator mounting



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March 5, 1929 @fc/6MM Patented Mar. 5,A 1929.

UNITED STATES PATENT OFFICE.

BERNARD KATZENBERGER AND THEODOR JANSEN, OF MANNHEIM, GERMANY, Asf- SIGNORS TO AKTIENGESELLSCHAFT BROWN BOVERI & CIE., F BADEN, SWITZER- LAND, A JOINT STOCK COMPANY OF SWITZERLAND.

INSULATOR MOUNTING. i

Application tiled August 22, 1927, Serial No. 214,512, and in Germany July 28, 1926.

This invention relates to insulator mountings, and it has among its objects an iniproved construction of an insulator and 1nsulator bolt for suspending or mounting the insulator.l

According to the invention the pull between the insulator and its point of anchorage is transmitted by means of a simple bolt or pin having at its head two or more projections or lugs which are inserted into longitudinal grooves in the recess within therinsulator and then rotated about the axis of the bolt until the projections slide above the insulator ribs, separating the grooves, and lock lin this position.

The features of the invention will best appear fron'i the following description of an exemplifcation thereof, reference being had to the accompanying drawings, wherein Fig. 1 is a vertical section through a suspension insulator embodying one form of the invention;

Fig. 2 is a horizontal section through the insulator along lines II--II of Fig. 1; and

Fig. 3 is a similar View along lines IIL-III of Fig. 1.

Referring to the drawings, an insulator of the cap and pin type comprises a body of porcelain of familiar shape having a skirt portion 1 and a head portion 2 in the form of a linob adapted to fit into a metal cap 3 into which the head may be cemented, as by means of a cement layer 4. The up er end of the cap 3 is provided with a per orated opening 5 for receiving the enlarged lower end 6 of a pin 7 suspended from an insulator above it.

The insulator head 2 has a central perforation 11 extending from the bottoni surface thereof into the insulator head 2 and constituting at its upper end a cavity or chamber 12 within said head. The porcelain body around said central perforation 11 is provided with two or three longitudinal grooves 13 which are arrangedy to permit passage of correspondingly shaped lateral projections or lugs 14 at the head of the pin 7 adapted to be inserted into the perforation 11 from the bottom opening thereof.

The cavity 12 within the insulator head is of hemispherical shape and the projections or lugs 14 are shaped to correspond to said hemispherical space and be rotated therein after having been placed therein through the axial grooves 13. The pin 7 carries an additional set of projections 15, preferably formed on a washer 16 secured to the pin, said washer projections 15 corresponding to the projections or lugs 14 on the head of the pin 7. The washer 16 with its projections is so placed on said pin 7 as to be locked against rotation relative thereto and is placed at a suitable height, preferably immediately behind the opening of the perforation 11. Suitable slots or circumferential grooves 18 within the ribs 19, separating the grooves 13 of the insulator, are arranged to receive the projections 15 of said washer when said projections are turned with the pin 7 within the perforation after insertion thereof.

To mount the pin within the insulator, the pin is held so that the proj ect-ions or lugs 14 are opposite the grooves 13 and the pin is moved upwardly until said projections reach the cavity near the top of the porcelain head. The pin is thereupon rotated about 60 degrees until the projections 14 are opposite the ribs 19, separating the grooves, said ribs thus preventing said pin from dro ping down. This brings also the was er projections 15 into the circumferential grooves 18 at the lower portions of said ribs 19.

To hold the bolt in its final position the grooves 13 may be filled with a suitable substance adapted to become hard, such as lead or cement. In the preferred construction wedges of metal, wood, fibre or like material are inserted into said grooves and suitably cemented or locked therein. A flexible washer 21, for instance, of lead, may be placed between the lower surfaces of the head projections 14 and the upper surfaces of the ribs which carry said projections. The wedges arranged to be inserted into the grooves 13, after locking the pin 7 in place, may also be flexible or elastic and arranged to lock in place so as to prevent their working loose.

A wedge of such construction is illustrated in the drawing wherein the lower portion of the wedge is split at 23 and biased so that on being inserted into the grooves the lower ends thereof will spread and lock in a recess 24 at the corresponding point in the pin or in a similar recess 25 in the insulator wall, or in both. The use of the wedge makes it possible to readily determine whether the pin has been correctly assembled and mounted within the insulator, because only whenrtheV upper projections 14 and the lower projections YI5, carried'by the pin, lit into their appropriate places along the ribs is it possible to insert the Wedge 22 into the grooves 13.

Where a liquid filler or cement is used to hold the pin in place, a suitablevmarkrisy provided on an exposed portion of the pin near the lower end thereof. Such mark is, in genemhhowever, not necessary in constructions utilizingthe additional locking washer 16 vwith `its projections l5, because as long as the 'pin is not in its appropriate angular vposition in which it is to be held, the washer projections 15 obstruct the flow of the sealing liquidr or4 cement into the grooves if it is attempted to pour the same inplace. Only ifthe head and washerprojections are Ain their appropriate positions the grooves will be clear for introducing the sealing lliquid thereto. Thus the washer serves as an automatic check, making it impossible zto pour in the sealing liquid until the pin is in correct position. It is, of course, possible to use both a liquid-or cement `filler and -the `spring wedge 22.

The invention is not limited to any particular detail of the construction or any particular t-ype of insulator, and it is desired that the appended claims be construed broadly commensurate with the scopeof the invention within the fart,

XVe claim -asour invention l. In a pin Vtype insulator, an insulator body of ceramic material, saidbodyhaving a perforation extending from one side there-`V of into the interior of said body, the walls of said perforation having longitudinal grooves with ribs of said ceramic body eX- tending between said groovessaid ribs'ending in theinterior of said body at a height belowthe 'end of said perforation to provide an venlarged cavity in rthe interior of said body, a mounting pin for said insulator having a shank portion projecting through said perforation intor the interior of said insulator and Aa head portion comprising a plurality of laterally projecting` lugs at the end of said shank portion, said lugs corresponding to `said grooves andbeing adapted to be inserted therethrough with said `pin from outside of said insulator body into said cavity and rotated therein to bear vagainst the ends of said ribs within said cavity, and wedge vmembers 'fitting -said grooves for locking said head projections against lateral rotation.

y2,. In a pin type insulator, an insulator body of ceramic material, said :body rhaving a perforation extending from zoneside thereof into the interior of rsaid body, the walls or said perforation having longitudinal grooves with ribs of saidceramic body extending between said grooves, said ribs ending in-the interior of said body at a height below Ythe end of said perforation to provide an .enlarged cavity .in the interior of said body, a mounting pin for said insulatorhaving a shank portion projecting through said perforation into the interior of said insulator, and a head portion comprising a pluy,rality ofslaterallyvprojectinglugs at the end of said shank portion, said lugs corresponding to said groovesiand being adapted to .be inserted therethrough with said pin from outside of said insulator bodyintosaid cavity and rotated therein to bear -against the ends of said ribs within said cavity, wedge members fitting said grooves for locking `sait head projections against lateral rot-ation, and ymeans on said wedge-members for locking-the same against longitudinal'movement in said grooves. f

3. In la .pin type insulator, an .insulator body of ceramic material, said'body having a perforation extending from Onesidethereof into the interior of said body, the walls of said perforation having longitudinal grooves with ribsof said ceramic body eX- tending between said grooves,:said ribs rendingin the interiorof said body at a height below the end ofsaid perforationto provide an enlarged cavity in the interior of said body, a mounting pin `for said insulator having a shank portion projecting through said perforation into Ythe interior of-said insulater, and a head portion comprising a plurality of laterally projecting lugs at the end of said shank portion, said lugs correspondingto said grooves and beingadapted Ato 4be inserted therethrough with .said pin from outside of said insulatorv body into said-cavity and rotated thereinto bear againstthe ends of said ribs within said cavity, and wedge members `fitting said grooves lfor locksaid :head projections against lateral rotation, said' wedge fmembers 'being of the spring 'type and said pin having recesses iadapted ,tok receive the projecting portions Vof said wedge members to prevent 'longitudinal movement thereof .in said grooves 'on insertion thereof into the same. f

4. In a pin type insulator, an `insulator body of ceramic material, said bodyhaving a perforation extending fromone side thereof into the interior of said body, the walls of said perforation havin-g longitudinal grooves with vribs of said ceramic body-exi tending between said grooves, v`said ribs-ending in the rinterior of said body avt-1a Aheight below the end 'of said perforation to provide an enlarged cavity inthe interior of said body, amounting pin -fforsaid insulator having a shank portion Iprojecting through said perforation into fthe interior of said insulator and a head portion comprisinga plurality of laterally projecting flugs fat the end of said shank portion, said lugs corresponding to said grooves and being adapted to be inserted therethrough with said pin from outside of said insulator body into said cavity and. rotated therein to bear against the ends of said ribs within said cavity, and a second set of projections on said pin corresponding to the projections on said head, said second set of projections being near the entrance into said perforation.

In a pin type insulator, an insulator body of ceramic material, said body having a perforation extending from one side thereof into the interior of said body, the Walls of said perforation having longitudinal grooves with ribs of said ceramic body extending between said grooves, said ribs ending in the interior of said body at a height below the end of said perforation to provide an enlarged cavity in the interior of said body, a mounting pin for said insulator having a shank portion projecting through said perforation into the interior of said insulator and a head portion comprising a plurality of laterially projecting lugs at the end of said shank portion, said ings corresponding to said grooves and being adapted to be inserted therethrough with said pin from outside of said insulator body into said cavity and rotated therein to bear against the ends of said ribs Within said'cavity, means for locking said pin in position against rotation thereof within said perforation, and a second set of projections on said pin ixedly aligned with the projections on said head, said second set of projections being disposed near the entrance of said perforation.

6. In a pin type insulator, an insulator body of ceramic material, said body having a perforation extending from one side thereof into the interior of said body, the Walls of said perforation having longitudinal grooves with ribs of said ceramic body eX- tending between said grooves, said ribs ending in the interior of said body at a height below the end of said perforation to provide an enlarged cavity in the interior of said body, a mounting pin for said insulator having a shank portion projecting through said perforation into the interior of said insulator and a head portion comprising a plurality of laterally projecting lugs at the end of said shank portion, said lugs corresponding to said grooves and being adapted to be inserted therethrough with said pin from outside of said insulator body into said cavity and rotated therein to bear against the ends of said ribs Within said cavity, Wedge members fitting said grooves for locking said head projections against lateral rotation, and a second set of projections on said pin corresponding to the project-ions on said head, said second set of projections being near the entrance into said perforation.

In testimony whereof We have hereunto subscribed our names this 5th day of July A. D., 1927, at Stuttgart, Germany.

B. KATZEN BERGER. TH. JANSEN. 

